JDBC

Question

我正在尝试构建一个小型控制台应用程序，用于接收公司员工的 ID 并打印 his/her 详细信息。一切顺利，但是当涉及到员工的任命日期时，它会给出日期和时间。示例：“2005-03-10 00:00:00.0”

我在这里要做的是，我只想要“2005-03-10”。那怎么办？这是代码：

public static void main(String[] args) {

    Scanner read = new Scanner(System.in);
    try
    {
    Class.forName("oracle.jdbc.driver.OracleDriver");
    Connection conn = DriverManager.getConnection("jdbc:oracle:thin:sys/password@//localhost:1521:xe");
    Statement st = conn.createStatement();

    System.out.print("Enter the id of employee: ");
    String id = read.next();

    String sql = "SELECT E.EMP_NAME, D.DEPT_NAME, ES.ROLE, ES.DATE_OF_APPOINTMENT, S.SALARY "
            + "FROM EMPLOYEE E, DEPARTMENT D, DEPARTMENT_ROLE DR, EMPLOYEE_SERVICE ES, SALARY S "
            + "WHERE E.EMP_ID = ES.EMP_ID AND E.EMP_ID=S.EMP_ID AND D.DEPT_ID=DR.DEPT_ID AND DR.ROLE=ES.ROLE "
            + "AND E.EMP_ID='"+id+"'";

    ResultSet rs = st.executeQuery(sql);

    while(rs.next()){
        System.out.println("\n\nEmployee Name\t: "+rs.getString(1)+"\nDepartment\t: "+rs.getString(2)
                +"\nRole\t\t: "+rs.getString(3)+"\nAppointed On\t: "+rs.getString(4)+"\nSalary\t\t: "+rs.getString(5));
    }
    st.close();
    conn.close();
    read.close();
    }
    catch(SQLException e){
        e.printStackTrace();
    }
    catch(Exception se){
        se.printStackTrace();
    }
}

输出如下所示：

请输入员工编号：CCT003

员工姓名：约瑟夫·布朗

部门：人力资源

角色：行政招聘人员

任命于 : 2006-02-13 00:00:00.0

工资：118000

请帮忙。谢谢

Answer 1

由于您正在以字符串形式检索数据，因此您只需再添加一个步骤并对其进行格式化

String sql = "SELECT E.EMP_NAME, D.DEPT_NAME, ES.ROLE, TO_CHAR(ES.DATE_OF_APPOINTMENT,'YYYY-MM-DD') AS DATE_OF_APPOINTMENT, S.SALARY "
            + "FROM EMPLOYEE E, DEPARTMENT D, DEPARTMENT_ROLE DR, EMPLOYEE_SERVICE ES, SALARY S "
            + "WHERE E.EMP_ID = ES.EMP_ID AND E.EMP_ID=S.EMP_ID AND D.DEPT_ID=DR.DEPT_ID AND DR.ROLE=ES.ROLE "
            + "AND E.EMP_ID='"+id+"'";

Answer 2

您可以修改 SQL 查询并使用 Oracle TO_CHAR() 函数：

    TO_CHAR(ES.DATE_OF_APPOINTMENT, 'YYYY-MM-DD') as DATE_OF_APPOINTMENT

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